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Abstract

We report the design and experimental measurement of a powered active magnetic metamaterial with tunable permeability. The unit cell is based on the combination of an embedded radiofrequency amplifier and a tunable phase shifter, which together control the response of the medium. The measurements show that a negative permeability metamaterial with zero loss or even gain can be achieved through an array of such metamaterial cells. This kind of active metamaterial can find use in applications that are performance limited due to material losses.

Figures (5)

Fig. 1. (Color online) (a) Photograph of the constructed unit cell for the powered active magnetic metamaterial with individual components labeled. (b) A schematic of a single unit cell (solid) and three unit cells (dashed) inside the waveguide in the measurements. The incident magnetic field is perpendicular to the planes containing the loops, and volume under test to which all extracted effective parameters apply is bounded by the dashed lines.

Fig. 4. (Color online) The retrieved permeability, permittivity, and the calculated total power loss in the case of Vb=4.5V. Dashed lines denote the zero-imaginary-permeability frequencies, and solid lines denote the frequencies at which the unit cell is lossless.

Fig. 5. (Color online) Retrieved permeability for (a) the three unit cells measured individually, and (b) an array of these three cells. Expected permeability from susceptibility adding of the individually measured unit cells is also shown in (b) for comparison.